Tensionless Strings. Vertex Operator for Fixed Helicity States

TL;DR

This paper studies the vertex operators and scattering amplitudes in tensionless string theory, focusing on fixed helicity states, to understand interactions among massless higher-spin particles.

Contribution

It introduces and analyzes the vertex operator for fixed helicity states in tensionless string theory, advancing the understanding of interactions among massless higher-spin particles.

Findings

Defined lowest order vertex operators for tensionless strings.

Computed tree-level scattering amplitudes.

Highlighted the significance of fixed helicity vertex operators.

Abstract

The tensionless string theory with perimeter action has pure massless spectrum of higher-spin gauge fields. The multiplicity of these massless states grows linearly. It is therefore much less compared with the standard string theory and is larger compared with the field theory models of the Yang-Mills type. It is important to define nontrivial interaction between infinite amount of massless particles of the perimeter string theory. The appropriate vertex operators were defined recently and I study the lowest order vertex operators and the corresponding scattering amplitudes in tree approximation. I emphasize the special importance of the vertex operator for fixed helicity states.